NZ772827A - Thin film for waste packing cassettes - Google Patents
Thin film for waste packing cassettesInfo
- Publication number
- NZ772827A NZ772827A NZ772827A NZ77282721A NZ772827A NZ 772827 A NZ772827 A NZ 772827A NZ 772827 A NZ772827 A NZ 772827A NZ 77282721 A NZ77282721 A NZ 77282721A NZ 772827 A NZ772827 A NZ 772827A
- Authority
- NZ
- New Zealand
- Prior art keywords
- less
- film
- multilayer film
- layer
- weight
- Prior art date
Links
- 239000002699 waste material Substances 0.000 title abstract description 8
- 239000010409 thin film Substances 0.000 title description 2
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000005977 Ethylene Substances 0.000 claims description 20
- 229920001577 copolymer Polymers 0.000 claims description 20
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 19
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 18
- 239000004952 Polyamide Substances 0.000 claims description 18
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 18
- 239000004700 high-density polyethylene Substances 0.000 claims description 18
- 229920002647 polyamide Polymers 0.000 claims description 18
- 239000011528 polyamide (building material) Substances 0.000 claims description 17
- 229920001903 high density polyethylene Polymers 0.000 claims description 12
- 239000004711 α-olefin Substances 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 9
- 229920002292 Nylon 6 Polymers 0.000 claims description 8
- 230000000875 corresponding Effects 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-Hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 3
- 239000010408 film Substances 0.000 description 101
- 239000000543 intermediate Substances 0.000 description 35
- 101700080270 ADH2 Proteins 0.000 description 9
- 239000000654 additive Substances 0.000 description 8
- 230000000844 anti-bacterial Effects 0.000 description 8
- 229920001684 low density polyethylene Polymers 0.000 description 8
- 239000004702 low-density polyethylene Substances 0.000 description 8
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 7
- 239000004594 Masterbatch (MB) Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 229920001519 homopolymer Polymers 0.000 description 7
- 101700007462 ADH1A Proteins 0.000 description 5
- 102100000356 ADH1A Human genes 0.000 description 5
- 229920002302 Nylon 6,6 Polymers 0.000 description 5
- 101710044706 SFA1 Proteins 0.000 description 5
- 101710025952 adhT Proteins 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 5
- FQVLRGLGWNWPSS-BXBUPLCLSA-N (4R,7S,10S,13S,16R)-16-acetamido-13-(1H-imidazol-5-ylmethyl)-10-methyl-6,9,12,15-tetraoxo-7-propan-2-yl-1,2-dithia-5,8,11,14-tetrazacycloheptadecane-4-carboxamide Chemical compound N1C(=O)[C@@H](NC(C)=O)CSSC[C@@H](C(N)=O)NC(=O)[C@H](C(C)C)NC(=O)[C@H](C)NC(=O)[C@@H]1CC1=CN=CN1 FQVLRGLGWNWPSS-BXBUPLCLSA-N 0.000 description 4
- 239000004698 Polyethylene (PE) Substances 0.000 description 4
- 230000000996 additive Effects 0.000 description 4
- 230000000845 anti-microbial Effects 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000005033 polyvinylidene chloride Substances 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- LGXVIGDEPROXKC-UHFFFAOYSA-N 1,1-Dichloroethene Chemical compound ClC(Cl)=C LGXVIGDEPROXKC-UHFFFAOYSA-N 0.000 description 2
- 229960003563 Calcium Carbonate Drugs 0.000 description 2
- 101710003361 SNRPD3 Proteins 0.000 description 2
- 241000191967 Staphylococcus aureus Species 0.000 description 2
- 229940076185 Staphylococcus aureus Drugs 0.000 description 2
- 239000004708 Very-low-density polyethylene Substances 0.000 description 2
- 150000001408 amides Chemical group 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 2
- 229920001866 very low density polyethylene Polymers 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 description 1
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L Calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 241001643597 Evas Species 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 101700076513 KIN11 Proteins 0.000 description 1
- 210000000088 Lip Anatomy 0.000 description 1
- VMRGZRVLZQSNHC-UHFFFAOYSA-N N-octadec-9-enylhexadecanamide Chemical compound CCCCCCCCCCCCCCCC(=O)NCCCCCCCCC=CCCCCCCCC VMRGZRVLZQSNHC-UHFFFAOYSA-N 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920000572 Nylon 6/12 Polymers 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N Oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 229920001083 Polybutene Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- 229940035295 Ting Drugs 0.000 description 1
- 241001459538 Ute Species 0.000 description 1
- 229920001567 Vinyl ester Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000005250 alkyl acrylate group Chemical group 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 244000052616 bacterial pathogens Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000001010 compromised Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- ALSOCDGAZNNNME-UHFFFAOYSA-N ethene;hex-1-ene Chemical compound C=C.CCCCC=C ALSOCDGAZNNNME-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000010807 litter Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 150000002734 metacrylic acid derivatives Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920002225 poly(styrene-co-butadiene) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 230000001737 promoting Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical group [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Abstract
The present invention refers to a polymeric film comprising odor barrier material and being able to pack malodorous waste.
Description
P51481-EP
Flexopack S.A.
THIN FILM FOR WASTE PACKING CASSETTES
The present invention s to a multilayer film for use in malodorous item
packaging.
A lot of waste products produce smells that are annoying to the environment.
Example are decayed food, kid nappies and cat litter.
In the prior art there are many films that could be used for protection from
rs. As well known in the art, the use of materials like EVOH, PVDC,
polyacrylonitrile is ended in order to not allow malodors escape from the
container (e.g. bag or another configuration) and create an unpleasant atmosphere.
There are also a lot of known urations of packing a certain length of film
(e.g. 20 meters) in a compressed form (e.g. in a cassette). Examples of the
representative cassettes are shown in US 4,934,529 or US 3,536,192.
Generally, the cassette comprises a tubular core, casing wall and cassette bottom.
The film is pulled through the area between the lid of the cassette and the casing
wall. The flexible tubing is dispensed from the cassette. After the malodorous item
is thrown into the bag the core is d and the flexible tube is twisted so that it
closes as hermetically as possible the waste/environment area.
To e the next diaper, the user pulls the next portion of film. The us
hermetically closed diaper is pulled downwards and the new diaper is packed in a
new configuration. All these different packs are stored in a bin which is
periodically emptied.
Separation of one pack to the other can be done by various means. A rotary knife
is preferred.
FILM CHARACTERISTICS
P51481-EP
Flexopack S.A.
In the prior art a lot of possible film configurations either monolayer or multilayer
have been proposed. The basic characteristics a film should have in order to be
used in the particular case are
1. Barrier to odors
2. To have the proper deadfold properties so that is compressed ently in
the cassette.
3. To have sufficient mechanical properties (e.g. tensile th at break,
elongation).
With new environmental rules promoting the concept of “less plastic”, it is critical
to produce films with lower thickness. At the same time, it is imperative that these
films keep excellent barrier and mechanical properties.
Patent application EP 2 085 216 gives an example of production of successful
films for this application. However, it is challenging to produce films with lower
weight than 14 g/m2 as the bubble stability of the hot blown film is compromised.
r, the use of substantial non ent material increases the possibility to
have increased die lip deposits (die . Further, the use of such materials may
not allow the coefficient of friction to go to as low as 0.2 (kinetic coefficient of
friction, film to film, ASTMD 1894) which is often desired in such applications.
For example, films according to EP 2 085 216 have kinetic coefficient of friction
(film to film and measured as per ASTM D1894) of more than 0.30 which creates
serious issues during filling of the tes or in the use of the film or cassette by
the consumer.
Further, the films according to EP2085216 cannot be ged easily to as thin
as 10 g/m2 which is a ble effect for environmental reasons as long as
mechanical properties are adequate.
We have surprisingly found that all the features required for such application can
be ed with a very lightweight multilayer film with a weight of less than
g/m2. This is extremely beneficial for the environment as multilayer films are
extremely difficult to be produced with so small weight per surface.
P51481-EP
Flexopack S.A.
SUMMARY OF THE INVENTION
In a first aspect the invention is directed to a multilayer film with weight less than
20g/m2 for use in malodorous item packaging, wherein the film comprises two
outer layers, wherein at least one of the outer layers comprise at least 50% per
weight high density polyethylene (HDPE) based on the total weight of the
corresponding layer and wherein the film comprises at least one barrier layer
sing a polymer selected from polyamide, polyester and/or EVOH.
In a further aspect of the invention both outer layers comprise at least 50% per
weight high density polyethylene (HDPE).
The multilayer preferably ses in the barrier layer EVOH.
The multilayer film preferably does not contain polypropylene.
The total amount of substantially non-resilient al in the multiplayer film is
preferably 30% per weight or less, more preferably 25% per weight or less, even
more preferably 20% per weight or less.
The total amount of substantially non-resilient material in each outer layer is
preferably 50% per weight or less, more preferably 40% per weight or less, even
more preferably 30% per weight or less.
According to a preferred the multilayer film has a weight less than 18 g/m2,
preferably less than 17 g/m2, more preferably less than 16 g/m2, even more
preferably less than 15 g/m2, most preferably less than 14 g/m2, and in particular
less than 13 g/m2.
Preferably, the weight of each outer layer in the multilayer film is less than 8 g/m2,
more preferable less than 6 g/m2, most preferably less than 5 g/m2.
ably, the HDPE is in blend with an ethylene alpha olefin mer,
preferably hexene or octene copolymer.
P51481-EP
Flexopack S.A.
The HDPE comprised in at least one of the two outer layers has preferably a
density of at least 0.940 g/cm3, more preferable at least 0.945, more preferably at
least 0.950.
In a preferred embodiment the multilayer film r comprises at least one
intermediate layer comprising polyamide, ably the polyamide is polyamide
6 or polyamide 6/66.
In a preferred embodiment of the multilayer film at least one or both of the outer
layer comprise a slip agent, preferably, the slip agent is an amide-based slip agent.
In the multilayer film of the present invention both outer layers have a kinetic
film-to-film coefficient of friction of less than 0.35 measured according to
ASTMD1894, preferably the coefficient of friction is less than 0.30, more
preferably the coefficient of friction is less than 0.25, even more preferably less
than 0.2.
In a preferred embodiment the multilayer film comprises, preferably consists of
the ing layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / BARRIER LAYER /
INTERMEDIATE LAYER 3 / OUTER LAYER
Wherein INTERMEDIATE LAYER 1 and 3 can se the same or different
materials.
In a further preferred embodiment, the multilayer film comprises, preferably
consists of the following :
OUTER LAYER / EDIATE LAYER 1 / INTERMEDIATE LAYER 2 /
R LAYER / INTERMEDIATE LAYER 3 / INTERMEDIATE LAYER 4
/ OUTER LAYER
P51481-EP
Flexopack S.A.
Wherein each of EDIATE LAYER 1-4 can comprise the same or
different materials.
In a preferred embodiment the multilayer film presents an antibacterial activity
characterized by a decline of at least 20% of the population of Staphylococcus
aureus held in contact with at least one of the outer layers of the film for 24 hours
compared to the initial population, measured according to ISO 2196/2011 for
measurement of the antibacterial activity on plastics and other non-porous
surfaces.
In a red ment the multilayer film at least one of the outer layers,
preferably both outer layers, additionally comprise 0.5-40% per weight, preferably
-30% per weight low density polyethylene (LDPE) based on the total weight of
the corresponding outer layer.
According to a second aspect a cassette is provided comprising a multilayer film
ing to the present invention.
A third aspect of the invention related to the use of a multilayer film according to
the present invention for waste packing.
Preferably, the film is stored in a te.
In a preferred embodiment the film is folded or the film is in the form of a bag.
Definitions:
In this application the following definitions are used:
The term “film” refers to a flat or tubular flexible structure of thermoplastic
material.
The term “heat able” refers to a film that shrinks at least 10% in at least one
of the longitudinal and transverse directions when heated at 90°C for 4 seconds.
P51481-EP
ack S.A.
The shrinkability is measured in water according to ASTM 2732. For
temperatures like 100°C or more, glycerine is used as a reference .
The term “total heat shrinkability” refers to the sum of heat shrinkability at the
MD direction and heat shrinkability at the TD direction. In all cases, ASTM 2732
is used for measurement of shrinkabilities.
The term “multilayer” refers to a film comprising 2 or more layers.
The phrase “longitudinal direction” or ne direction” herein abbreviated
“MD” refers to a direction along the length of the film.
The phrase “outer layer” refers to the film layer which comes in immediate
contact with the outside environment. Therefore, the film has two outer layers,
and when formed to a pack one of outer layers is inside of the pack and one at the
outside of the pack.
The phrase “inner layer” refers to any film layer that is not “outer layer».
As used herein, the term “homopolymer” refers to a polymer resulting from
polymerization of a single monomer.
As used herein, the term “copolymer” refers to a r resulting from
polymerization of at least two different polymers.
As used herein, the term “polymer” includes both above types.
As used herein, the term “polyolefin” refers to any polymerized olefin, which can
be linear, branched, cyclic, aliphatic, substituted or unsubstituted. More
ically, included in the term polyolefin are homopolymers of ,
copolymers of olefin, copolymers of an olefin and a non olefinic comonomer
(such as ester) etc.
P51481-EP
Flexopack S.A.
Specific examples include hylene homopolymer, polypropylene
homopolymer, polybutene homopolymer, ethylene alpha olefin copolymer,
propylene alpha olefin copolymer, butene alpha olefin mer, r,
ethylene ester copolymer etc.
As used herein the term “polyethylene” fies polymers ting essentially
of the ethylene repeating unit. The homopolymers of ethylene that have a density
more than 0.940 are called high density polyethylene (HDPE), the ones that are
have less than 0.940 are low density polyethylene (LDPE).
As used herein the phrase “ethylene alpha olefin copolymer” refers to ethylenebased
copolymers like linear low-density polyethylene (LLDPE), medium density
polyethylene (MDPE), very low-density polyethylene (VLDPE), ultra-low-density
polyethylene (ULDPE), metallocene catalyzed polymers and polyethylene
plastomers and elastomers.
As used herein the term “homogeneous ethylene alpha olefin copolymers” refer to
ethylene alpha olefin copolymers having a molecular weight distribution less than
2.7 as measured by GPC. Typical es of these rs are AFFINITY
from DOW or Exact from Exxon.
As used herein the phrase “styrene polymers” refers to styrene lymer such
as polystyrene and to styrene copolymers such as styrene-butadiene copolymers,
styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers,
styrene-ethylene-butadiene-styrene copolymers, ethylene-styrene copolymers and
the like.
As used herein the phrase “ethylene methacrylate copolymers” refers to
copolymers of ethylene and methacrylate monomer. The monomer content is less
than 40%.
As used herein the phrase “ethylene vinyl acetate copolymer” or EVA refer to
mers of ethylene and vinyl acetate.
P51481-EP
Flexopack S.A.
As used herein the phrase “ethylene ester copolymer” includes any polymer made
from ethylene and ester monomers. It is obvious that this term includes EVAs,
EMAs and other polymers.
As used herein the term “barrier polymer” refers to polymers which have the
ty to limit the passage of oxygen through a film or a layer comprising the
polymer. Common materials, are EVOH, PVDC or polyamide.
As used herein, the term EVOH refers to saponified products of ethylene vinyl
ester copolymers. The ne content is lly in the range of 25 to 50% per
mol. All the later references to EVOH ethylene content will be in % per mol.
As used herein the term PVDC refers to a vinylidene chloride mer wherein
a major amount of the copolymer comprises vinylidene chloride and a minor
amount of the copolymer comprises one or more monomers such as vinyl chloride
and/or alkyl acrylates and methacrylates.
As used herein the term “polyamide” refers to homopolymers and mers.
Polyamide 6, polyamide 66, polyamide 12, polyamide 6/66, polyamide 6/12,
polyamide elastomers, MXD polyamides and other copolymers are specifically
useful for the invention.
As used herein the term “polyester” refers to polymers comprising terephthalate
units. es of polyesters are PET (polyethylene terephthalate), PBT
(polybutylene terephthalate), polyester elastomer (block copolymer comprising
ester or ether , PTT and other similar polymers.
As used herein, the term “ionomer” comprises the mers of ethylene and
methacrylic or acrylic acid being metal neutralized. An e of such material
is Surlyn from Dupont.
As used herein, the term “polypropylene” refers to polymers incorporating
propylene structural units in a weight percentage of more than 50% per weight of
the total polymer. Examples of these, are homo polypropylenes, random
P51481-EP
Flexopack S.A.
copolymers of propylene and ethylene, block copolymers of ene and
ethylene, copolymers or blends of propylene and rubber (such as blends of
polypropylene and ethylene propylene ), propylene ethylene alpha olefin
terpolymers and .
These rs may be isotactic, syndiotactic or atactic. tic is preferred.
As used herein the term “substantially non resilient material” refers to materials or
al compounds comprising inorganics like calcium carbonate, titanium
dioxide, wollastonite, mica, glass fibers, dolomite, silica and the like.
All measurement methods mentioned herein are readily ble for the skilled
person. For example, they can be obtained from the American National Standards
ute at: www.webstore.ansi.org
All percentages are based on weight per weight ratio, except when otherwise
stated.
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect the present invention is directed to a multilayer film
with weight less than 20g/m2 for use in malodorous item packaging, where the
film comprises two outer layers comprising ethylene alpha olefin copolymers.
In a preferred embodiment the multilayer film comprises, preferably consists of
the following layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / INTERMEDIATE LAYER 2 /
BARRIER LAYER / INTERMEDIATE LAYER 3 / INTERMEDIATE LAYER 4
/ OUTER LAYER
Wherein each of INTERMEDIATE LAYER 1-4 can comprise the same or
different materials.
P51481-EP
Flexopack S.A.
In a preferred embodiment the multilayer film comprises, ably consists of
the following layers:
OUTER LAYER / INTERMEDIATE LAYER 1 / BARRIER LAYER /
INTERMEDIATE LAYER 3 / OUTER LAYER
Wherein EDIATE LAYER 1 and 3 can se the same or different
materials.
Detailed description of layers
r layer
Preferably, the multilayer film comprises a barrier layer.
In one embodiment the barrier layer comprises EVOH as a barrier material.
The EVOH used preferably has an ethylene content less than 48%, more
preferably less than 44%, more ably less than 38%, more preferably from 27
to 32% ethylene.
In another embodiment the barrier layer comprises polyamide as a barrier material.
The oxygen barrier material preferably has a weight of less than 5 g/m2, more
preferably less than 4 g/m2, even more preferably less than 2.5 g/m2.
Outer layers
The outer layer comprises preferably at least 50% per weight high y
polyethylene (HDPE). In a preferred version, both outer layer comprises at least
50% per weight high density polyethylene (HDPE).
P51481-EP
Flexopack S.A.
In a preferred embodiment the HDPE is used in blend with ethylene alpha olefin
copolymer, preferably hexene or octene copolymer.
In a further preferred embodiment at least one of the outer layers, preferably both
outer layers, additionally comprises 0.5-40%, preferably 5-30% per weight low
density polyethylene (LDPE) based on the total weight of the corresponding outer
layer.
In a further preferred version, the weight of each outer layer is less than 8 g/m2,
preferable less than 6 g/m2, more preferably less than 5 g/m2.
In a preferred version, at least one or both of the outer layer comprise a slip agent,
preferably, the slip agent is an based slip agent (lubricant).
Slip agents are preferable of the amide family, such as erucamide, oleamide,
oleyl-palmitamide, mide, mide and the like. Alternatively, the slip
may also se silicon or siloxane materials.
In a further preferred version of the ion the kinetic coefficient of friction of
each of the two outer layers ed upon itself (as per ASTMD1894) is less
than 0.35, more preferably less than 0.3, even more preferably less than 0.25, most
preferably less than 0.2.
Intermediate layers
In a preferred embodiment, the multilayer film comprises at least one intermediate
layer. The multilayer film can comprise l intermediates layers. Preferably
the intermedial layer(s) is (are) located between the barrier layer and one of the
outer layers. There can be more than one intermediate layer be located between
the barrier layer and one of the outer layers.
In the intermediate layers, typical adhesive resins like maleic anhydrite modified
polyolefins may be used. Typical es are BYNEL from Dupont and
OREVAC from Arkema.
ack S.A.
In another preferred n of the invention, an intermediate layer comprises a
polyamide. For example, a preferred version of the ion is
Outer layer / Intermediate layer 1 / Intermediate layer 2 / EVOH / polyamide /
Intermediate layer 3 / Outer layer
Outer layer / Intermediate layer 1 / Polyamide / EVOH / Polyamide / Intermediate
layer 3 / Outer layer
In another version of the invention, at least one intermediate layer comprises
polyamide.
If a multilayer film of the present invention comprises polyamide in an
intermediate layer, then ably polyamide 6 or polyamide 6/66 is used.
General
Additives well known in the art may be used in one or more layers of the present
invention. Slip additives, antifog additives, polymer sing aids may be used
if pertinent. Antimicrobial and/or antibacterial additives may also be used in one
or more of the layers to inhibit the microbe formation. Preferably the
antimicrobial or antibacterial additive is added to at least one, or both outer layers.
Preferably the antimicrobial or antibacterial additive is added to the outer layer in
direct contact to the product to be packed.
The antimicrobial/antibacterial ve preferably comprises silver, silver ion
and/or . More preferably it comprises silver ion.
The additive may be used in an amount of from 0.2 to 20% per weight of the
corresponding layer wherein the additive is added.
In a preferable version of the invention the film does not comprise polypropylene.
The total amount of substantially non-resilient material in the multiplayer film is
preferably 10% per weight or less, more preferably 7% per weight or less, even
P51481-EP
Flexopack S.A.
more preferably 5% per weight or less, in particular 3% per weight or less, based
on the total weight of the ayer film. Most preferably the multilayer-film
does not contain any substantially non-resilient material.
The total amount of substantially non-resilient material in each outer layer is
preferably 10% per weight or less, more preferably 7% per weight or less, even
more preferably 5% per weight or less, in ular 3% per weight or less, based
on the total weight of the corresponding outer layer. Most ably each outer
layer does not contain any substantially non-resilient material.
In a preferable version of the invention the film presents an antibacterial activity
as follows; a e of at least 20% of the population of Staphylococcus aureus
held in contact with at least one of the outer layers of the film for 24 hours
compared to the initial population. The measurements are made as per ISO
2196/2011 measurement of the antibacterial activity on plastics and other nonporous
surfaces.
In order to se the mechanical properties, the film may be linked with
one of the following methods.
E-beam radiation, gamma radiation, moisture crosslinking using silane grafting
compounds, peroxide crosslinking.
The film may be in tubular form or sealed at the edges or single sheet
configuration. It may also be folded once or many times (as per US 5,037,370 for
example). It can also be used in the form of a series of bags, gusseted or seted
, folded or not folded. Centerfold configuration is also possible.
The preferred production method for the film is the hot blown film method, which
is well known in the art. Other methods like extrusion through flat cast die is also
possible.
In a able embodiment the film is stored in a cassette prior to use, e.g. a
cassette as described in US 4,934,529.
P51481-EP
ack S.A.
According to a second aspect the present invention is directed to a cassette
comprising a film according to the present invention for use in waste packaging
applications. In a preferable embodiment a cassette as described e.g. in
US 4,934,529 is used.
According to a third aspect the present invention is directed to the use of a
multilayer film according to the present invention for waste packing, n the
film is preferably stored in a cassette.
In a preferable embodiment the film is stored in a cassette prior to use, e.g. a
cassette as described in US 4,934,529.
Mechanical properties
The film of the present application despite its low thickness is very good in
mechanical properties such as tensile strength and tion as per ASTM D882.
In a preferred version of the invention the film has a tensile th at break of at
least 20 N/MM2 in at least one of machine and transverse direction and an
elongation of at least 300% in at least one of machine and transverse directions.
EXAMPLES
A 5-layer film is ed in a commercial hot blown film line with the following
recipe
Outer layer 1, 80% HDPE+ 15% EAO1+ 5% erucamide based slip masterbatch
Intermediate layer 100% ADH 1
Barrier layer EVOH 1
Intermediate layer 100% ADH1
P51481-EP
Flexopack S.A.
Outer layer 2 80% HDPE+ 15% EAO1+ 5% erucamide based slip batch
See table 1
The thickness of the structure is 7.5/1.5/1.5/1.5/6 starting from the outer layer1
and going to the outer layer 2.
TABLE 1
Type Description Density
g/cm3
HDPE HDPΕ homopolymer 0.952
EAO1 Ethylene hexene 0.918
copolymer produced
with metallocene
catalysts
ADH1 LLDPE mod. 0.92
ve tie
EVOH 1 EVOH with 32% 1.19
ethylene
EVOH2 EVOH with 29% 1.2
ethylene
SNR 1 Calcium carbonate 1.7
polyethylene
compound
LDPE Low density
polyethylene of
density 0.924 and
MFI 0.7 at 190c, 2.16
SLIP Erucamide slip
batch
comprising 5%
erucamide
P51481-EP
Flexopack S.A.
PA1 Polyamide 6/66 1.13
The weight of the film is 17.3 g/m2.
EXAMPLE 2
A 5-layer film is produced in a hot blown film commercial line with the following
recipe
Outer layer 1, 95% HDPE+ 5% ide based SLIP masterbatch
Intermediate layer 100% ADH 1
Barrier layer EVOH 1
Intermediate layer 100% ADH1
Outer layer 2 95% HDPE+ 5% erucamide based SLIP masterbatch
The thickness of the structure is 6.5/1.5/1.5/1.5/5 starting from the outer layer 1
and going to the outer layer 2.
The weight of the material is 15.4 g/m2.
EXAMPLE 3
A 5-layer film is ed in a hot blown film commercial line with the following
recipe
Outer layer 1, 95% HDPE+ 5% erucamide based SLIP masterbatch
Intermediate layer 100% ADH 1
Barrier layer PA1
P51481-EP
Flexopack S.A.
Intermediate layer 100% ADH1
Outer layer 2 95% HDPE+ 5% erucamide based SLIP masterbatch
The thickness of the structure is 3/1.5/1.5/1.5/2 starting from the outer layer 1 and
going to the outer layer 2.
The weight of the material is 10.9 g/m2.
COMPARATIVE EXAMPLE
A 5-layer film is produced in a hot blown film cial line with the following
recipe
Outer layer 1, 65% EAO1+ 30% SNR 1+ 5% ide based SLIP masterbatch
Intermediate layer 100% ADH 1
Barrier layer EVOH 2
Intermediate layer 100% ADH1
Outer layer 2 65% EAO1+ 30% SNR1+ 5% erucamide based SLIP masterbatch
The thickness of the structure is 5/1.5/1.5/1.5/3 starting from the outer layer 1 and
going to the outer layer 2.
The weight of the material is 12.1 g/m2.
TESTS
1. Tensile strength and tion test is done according to ASTM D 882.
2. Compression testing
TEST 1.
Flexopack S.A.
Tensile strength and tion are measured as per ASTM D882.
MD stands for machine direction, whereas TD stands for transverse direction.
EXAMPLE TENSILE ELONGATION TENSILE ELONGATION
STRENGTH(MD) (MD) STRENGTH(TD) (TD)
1 34 270 30 385
2 37 245 30 365
3 39 260 28 355
COMPRESSION TESTING
A paper core of diameter 76 mm and height 50 cm was used in order to test
compression.
Around the diameter of paper core, a tubular film was placed and squeezed. The
film length was measured so that the film did not overpass the upper end of the
core. This test represents how easy is to put the tubular film in the cassette (so the
number of film meters that can be squeezed ).
For the ative film comprising high amounts of SNR 7.2 meter could be
used while for the films according to the invention 7.5 (film 1), 7.8 (film 2) and
8.2 (film 3) could be used.
Therefore, the ability of the innovative film to compress is better than the one of
the film of prior art.
COEFFICIENT OF FRICTION
Coefficient of friction (COF) was measured as per ASTM D1894 (kinetic, film to
film).
Flexopack S.A.
The comparative film has a COF of more than 0.3 at both outer layers, while the
films of the invention had values of less than 0.25.
Flexopack S.A.
PATENT
Claims (10)
1. A multilayer film with weight less than 20g/m2 for use in malodorous item packaging, wherein the film comprises two outer layers, wherein at least one of the outer layers comprise at least 50% per weight high density polyethylene (HDPE) based on the total weight of the corresponding layer and wherein the film comprises at least one barrier layer comprising a polymer ed from polyamide, polyester and/or EVOH.
2. The multilayer film according to claim 1, wherein both outer layers comprise at least 50% per weight high density polyethylene (HDPE).
3. The multilayer film according to any of the preceding claims where the r polymer is EVOH.
4. The multilayer film according to any of the preceding claims, wherein the film does not contain polypropylene.
5. The multilayer film according to any of the preceding claims, wherein the total amount of substantially non-resilient material in the film is 30% per weight or less, ably 25% per weight or less, more preferably 20% per weight or less,
6. The multilayer film according to any of the preceding claims, wherein the total amount of ntially non-resilient material in each outer layer is 50% per weight or less, preferably 40% per weight or less, more preferably 30% per weight or less.
7. The multilayer film according to any of the ing claims, wherein the film has a weight less than 18 g/m2, ably less than 17 g/m2, more preferably less than 16 g/m2, even more preferably less than 15 g/m2, most preferably less than 14 g/m2, and in particular less than 13 g/m2. P51481-EP Flexopack S.A.
8. The multilayer film according to any of the preceding claims, wherein the weight of each outer layer is less than 8 g/m2, preferable less than 6 g/m2, more preferably less than 5 g/m2.
9. The multilayer film according to any of the preceding claims, wherein the HDPE is in blend with an ethylene alpha olefin mer, preferably hexene or octene copolymer.
10. The multilayer film ing to any of the preceding claims, wherein the film further comprises at least one intermediate layer sing polyamide, preferably the polyamide is polyamide 6 or polyamide
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20215130.4 | 2020-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ772827A true NZ772827A (en) | 2021-02-26 |
Family
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